A region division approach for vehicle location and navigation is presented, which is based on
GPS technique, dead reckoning (DR) and the map matching of digital road networks. In order to meet the
needs ofwide applications, a region-divided model forthe vehicle location and navigation system(VLNS) is
established. Based on this model, a systematic analysis of the central module, and an outline design of the
VLNS are discussed on the following issues: (1) the dynamic switch of the workingmode between GPS and
CDGPS (conventional differential GPS), (2) the layered map database and the dynamic compile of the
layered map, and (3) the improved map matching algorithm that compensates the positioning errors of GPS
and dead reckoningwith the aid of digital map. It has been proved thatwith the region division approach,
the performances of the VLNSget improved. The VLNSmodel built in this paper can provide high precision
application not only for local-area, but also forwide-area users
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